Spectrochemical analysis of hard metals by a rotating disc technique: effect of impregnation and complexing agents

A spectrographic method has been developed for the simultaneous determination of the constituents W, Co, Ti, Ta and Nb and contaminants Fe, Ni, Or, Mn, Mg and Ca in hard metals. The samples were dissolved in hydrofluoric acid and nitric acid and the solutions stabilized with citric acid. Graphite discs were waterproofed in order to ensure control of the introduction of solution into the source. For the five types of hard metal samples studied no interelement effect was observed. Titanium has also been determined by means of a double-beam optical spectrometer.